Two subbranches of nanophotonics are distinguished based on far-field propagating light and near-field non-propagating light. These subbranches are known as diffraction-limited and beyond-diffraction-limit nanophotonics, respectively; Japanese researcher Ohtsu proposed the later. Under the diffraction-limited nanophotonics fall plasmonics, photonic crystals, quantum dot lasers, and silicon nanophotonics. These utilize conventional light waves for transmission of signals. In the beyond-diffraction-limit nanophotonics, prototype AND and NOT gate arrangements are presented. These work on near-field energy transfer between quantum dots. They use optical near field for conveying signals. Fundamentally different criteria are to be evolved for designing nanophotonic devices exploiting conventional and near-field approaches. The near-field approach may render possible the development of novel photonic systems.
KeywordsSurface Plasmon Resonance Photonic Crystal Plasma Oscillation Indium Antimonide Nanophotonic Device
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